Refactor the process of choosing validators.

src/trusted/service_runtime/service_runtime.gyp

 # -*- gyp -*-
 # Copyright (c) 2012 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     'conditions': [
       ['OS=="linux"', {
         'syscall_handler': [
@@ skipping 44 matching lines @@
           'name_service/default_name_service.c',
           'name_service/name_service.c',
           'sel_addrspace.c',
           'sel_ldr.c',
           'sel_ldr_standard.c',
           'sel_ldr_thread_interface.c',
           'sel_main_chrome.c',
           'sel_mem.c',
           'sel_qualify.c',
           'sel_validate_image.c',
+          '<(DEPTH)/native_client/src/trusted/validator/validator_init.c',
         ],
         'include_dirs': [
           # For generated header files from the x86-64 validator,
           # e.g. nacl_disallows.h.
           '<(SHARED_INTERMEDIATE_DIR)',
         ],
         'sources!': [
            '<(syscall_handler)',
         ],
         'actions': [
@@ skipping 334 matching lines @@
             '<(DEPTH)/native_client/src/trusted/platform_qualify/platform_qualify.gyp:platform_qual_lib64',
           ],
           'sources': [
             'sel_main_chrome_test.c',
           ],
         },
       ],
     }],
   ]
 }